(1B) The product $(a+b)(c+d)$
Practice
Expand and simplify.
*Write your answers with powers of $x$ in descending order. $\left(\square x^2 \pm \square x \pm \square\right)$
$\left(x-2\right)\left(x-8\right)$
$\left(x-2\right)\left(x-3\right)$
$\left(x-8\right)\left(1+x\right)$
$\left(x+7\right)\left(8+x\right)$
$\left(-3+x\right)\left(x-2\right)$
$\left(5+x\right)\left(x-4\right)$
$\left(7+x\right)\left(7+x\right)$
$\left(-9+x\right)\left(-4+x\right)$
$\left(5x+4\right)\left(8x+1\right)$
$\left(2x-1\right)\left(-x+3\right)$
$\left(7x+1\right)\left(5+3x\right)$
$\left(x-1\right)\left(1+6x\right)$
$\left(1+5x\right)\left(x-3\right)$
$\left(-4+7x\right)\left(x+5\right)$
$\left(3-4x\right)\left(5-3x\right)$
$\left(3-x\right)\left(-3+7x\right)$